Add optional pipeline parameter to set_state.
Added job_id property, storing the id of the currently executing job.
Added Worker.get_current_job() convenience method.
Update worker.py

Use docstring instead of comment. Sorry.
Deprecate worker.state.
Merge branch 'master' of https://github.com/mbr/rq into worker-get_job_id

Conflicts:
	rq/worker.py
Added tests for worker.get_current_job().
Renamed worker.set_job_id() and worker.get_job_id() for consistency.
Python 3 compatibility with worker.get_current_job().
Added DeprecationWarning to worker.state.
Merge pull request #319 from selwin/worker-get_job_id

Worker.get_current_job()
Deprecate job.status.
Merge pull request #320 from selwin/deprecate-job-status

Deprecate job.status